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Use spatial scalability when simulcast is not available.

If the client requested a low-resolution stream and there is none,
switch to SID=0.
This commit is contained in:
Juliusz Chroboczek 2021-08-03 13:10:55 +02:00
parent 4f7be19644
commit 48a9b10ce8
3 changed files with 45 additions and 10 deletions

View file

@ -129,8 +129,12 @@ func (down *rtpDownTrack) SetCname(cname string) {
}
type layerInfo struct {
// current sid, desired sid, and max sid seen
sid, wantedSid, maxSid uint8
// current tid, desired tid, and max tid seen
tid, wantedTid, maxTid uint8
// if true, stick to sid 0
limitSid bool
}
func (down *rtpDownTrack) getLayerInfo() layerInfo {
@ -139,6 +143,7 @@ func (down *rtpDownTrack) getLayerInfo() layerInfo {
sid: uint8((info & 0xF)),
wantedSid: uint8((info >> 4) & 0xF),
maxSid: uint8((info >> 8) & 0xF),
limitSid: ((info >> 12) & 1) != 0,
tid: uint8((info >> 16) & 0xF),
wantedTid: uint8((info >> 20) & 0xF),
maxTid: uint8((info >> 24) & 0xF),
@ -146,10 +151,15 @@ func (down *rtpDownTrack) getLayerInfo() layerInfo {
}
func (down *rtpDownTrack) setLayerInfo(info layerInfo) {
var l uint32
if info.limitSid {
l = 1 << 12
}
atomic.StoreUint32(&down.atomics.layerInfo,
uint32(info.sid&0xF)|
uint32(info.wantedSid&0xF)<<4|
uint32(info.maxSid&0xF)<<8|
l|
uint32(info.tid&0xF)<<16|
uint32(info.wantedTid&0xF)<<20|
uint32(info.maxTid&0xF)<<24,
@ -221,6 +231,7 @@ func (down *rtpDownTrack) Write(buf []byte) (int, error) {
layer := down.getLayerInfo()
// increase eagerly if this is the first time we see a given layer
if flags.Tid > layer.maxTid || flags.Sid > layer.maxSid {
if flags.Tid > layer.maxTid {
if layer.tid == layer.maxTid {
@ -230,7 +241,7 @@ func (down *rtpDownTrack) Write(buf []byte) (int, error) {
layer.maxTid = flags.Tid
}
if flags.Sid > layer.maxSid {
if layer.sid == layer.maxSid {
if layer.sid == layer.maxSid && !layer.limitSid {
layer.wantedSid = flags.Sid
layer.sid = flags.Sid
}
@ -240,6 +251,7 @@ func (down *rtpDownTrack) Write(buf []byte) (int, error) {
down.adjustLayer()
layer = down.getLayerInfo()
}
if flags.Start && (layer.tid != layer.wantedTid) {
if layer.wantedTid < layer.tid || flags.TidUpSync {
layer.tid = layer.wantedTid
@ -331,7 +343,10 @@ func (t *rtpDownTrack) adjustLayer() {
if rate < max*7/8 {
// switch up
layer := t.getLayerInfo()
if layer.sid < layer.maxSid {
if layer.limitSid && layer.wantedSid != 0 {
layer.wantedSid = 0
t.setLayerInfo(layer)
} else if !layer.limitSid && layer.sid < layer.maxSid {
layer.wantedSid = layer.sid + 1
t.setLayerInfo(layer)
} else if layer.tid < layer.maxTid {
@ -345,7 +360,11 @@ func (t *rtpDownTrack) adjustLayer() {
layer.wantedTid = layer.tid - 1
t.setLayerInfo(layer)
} else if layer.sid > 0 {
layer.wantedSid = layer.sid - 1
if layer.limitSid {
layer.wantedSid = 0
} else {
layer.wantedSid = layer.sid - 1
}
t.setLayerInfo(layer)
}
}

View file

@ -18,7 +18,7 @@ func TestDownTrackAtomics(t *testing.T) {
down.setSRTime(4, 5)
down.maxBitrate.Set(6, rtptime.Jiffies())
down.maxREMBBitrate.Set(7, rtptime.Jiffies())
info := layerInfo{8, 9, 10, 11, 12, 13}
info := layerInfo{8, 9, 10, 11, 12, 13, true}
down.setLayerInfo(info)
ntp, rtp := down.getTimeOffset()
rtt := down.getRTT()

View file

@ -446,7 +446,7 @@ func delDownTrackUnlocked(conn *rtpDownConnection, track *rtpDownTrack) error {
return os.ErrNotExist
}
func replaceTracks(conn *rtpDownConnection, remote []conn.UpTrack) (bool, error) {
func replaceTracks(conn *rtpDownConnection, remote []conn.UpTrack, limitSid bool) (bool, error) {
conn.mu.Lock()
defer conn.mu.Unlock()
@ -489,6 +489,17 @@ outer2:
del = append(del, track)
}
defer func() {
for _, t := range conn.tracks {
layer := t.getLayerInfo()
layer.limitSid = limitSid
if limitSid {
layer.wantedSid = 0
}
t.setLayerInfo(layer)
}
}()
if len(del) == 0 && len(add) == 0 {
return false, nil
}
@ -729,7 +740,7 @@ func requestConns(target group.Client, g *group.Group, id string) {
}
}
func requestedTracks(c *webClient, override []string, up conn.Up, tracks []conn.UpTrack) []conn.UpTrack {
func requestedTracks(c *webClient, override []string, up conn.Up, tracks []conn.UpTrack) ([]conn.UpTrack, bool) {
r := override
if r == nil {
var ok bool
@ -738,7 +749,7 @@ func requestedTracks(c *webClient, override []string, up conn.Up, tracks []conn.
r, ok = c.requested[""]
}
if !ok || len(r) == 0 {
return nil
return nil, false
}
}
@ -777,6 +788,7 @@ func requestedTracks(c *webClient, override []string, up conn.Up, tracks []conn.
}
var ts []conn.UpTrack
limitSid := false
if audio {
t := find(webrtc.RTPCodecTypeAudio)
if t != nil {
@ -796,10 +808,13 @@ func requestedTracks(c *webClient, override []string, up conn.Up, tracks []conn.
)
if t != nil {
ts = append(ts, t)
if t.Label() != "l" {
limitSid = true
}
}
}
return ts
return ts, limitSid
}
func (c *webClient) PushConn(g *group.Group, id string, up conn.Up, tracks []conn.UpTrack, replace string) error {
@ -991,6 +1006,7 @@ func clientLoop(c *webClient, ws *websocket.Conn) error {
func pushDownConn(c *webClient, id string, up conn.Up, tracks []conn.UpTrack, replace string) error {
var requested []conn.UpTrack
limitSid := false
if up != nil {
var old *rtpDownConnection
if replace != "" {
@ -1002,7 +1018,7 @@ func pushDownConn(c *webClient, id string, up conn.Up, tracks []conn.UpTrack, re
if old != nil {
override = old.requested
}
requested = requestedTracks(c, override, up, tracks)
requested, limitSid = requestedTracks(c, override, up, tracks)
}
if replace != "" {
@ -1031,7 +1047,7 @@ func pushDownConn(c *webClient, id string, up conn.Up, tracks []conn.UpTrack, re
}
return err
}
done, err := replaceTracks(down, requested)
done, err := replaceTracks(down, requested, limitSid)
if err != nil || !done {
return err
}